CVE-2026-57750: ez Form Calculator Auth Bypass Flaw

CVE-2026-57750 Overview

CVE-2026-57750 is a broken access control vulnerability affecting the ez Form Calculator Premium WordPress plugin in versions up to and including 2.14.1.2. The flaw allows unauthenticated attackers to reach plugin functionality that should require authorization checks. The issue is classified under CWE-862: Missing Authorization.

An attacker can exploit the vulnerability across the network without user interaction or credentials. Successful exploitation affects integrity of plugin data while leaving confidentiality and availability unaffected.

Critical Impact
Unauthenticated attackers can invoke protected plugin actions on any WordPress site running a vulnerable version of ez Form Calculator Premium, enabling limited tampering with form calculator data.

Affected Products

ez Form Calculator Premium WordPress plugin versions <= 2.14.1.2
WordPress installations with the plugin activated
Any hosting environment exposing the vulnerable plugin endpoints to the internet

Discovery Timeline

2026-07-02 - CVE-2026-57750 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57750

Vulnerability Analysis

The ez Form Calculator Premium plugin exposes one or more actions without properly verifying the caller's authorization. This is a classic broken access control pattern in WordPress plugins where AJAX handlers, REST routes, or admin-post callbacks omit capability checks such as current_user_can() or nonce validation via check_ajax_referer().

Because the vulnerable endpoints are reachable over the network and require no privileges, any anonymous HTTP client can invoke them. The impact is scoped to integrity — attackers can trigger state-changing operations exposed by the plugin, but the flaw does not directly leak sensitive data or crash the site.

Sites that depend on the plugin for lead generation, quoting, or pricing workflows face the highest operational risk from tampered form submissions or configuration changes.

Root Cause

The root cause is missing authorization on plugin handlers ([CWE-862]). Developer-registered callbacks omit the permission checks that WordPress relies on to gate privileged actions. Without those checks, the plugin trusts the request itself rather than the identity behind it.

Attack Vector

Exploitation requires a single HTTP request to a vulnerable plugin endpoint on a target WordPress site. No authentication, no user interaction, and no elevated privileges are needed. Attackers can automate scanning for the plugin fingerprint and mass-invoke the unprotected action against exposed sites.

Refer to the Patchstack Vulnerability Advisory for endpoint-level technical details.

Detection Methods for CVE-2026-57750

Indicators of Compromise

Unexpected POST requests to wp-admin/admin-ajax.php referencing ez Form Calculator actions from unauthenticated sources
Requests to plugin REST routes or admin-post endpoints without a valid session cookie or nonce
Unexplained modifications to form calculator configurations, submissions, or plugin options

Detection Strategies

Inventory WordPress sites and identify installations running ez Form Calculator Premium <= 2.14.1.2
Enable WordPress debug logging or an audit plugin to capture callers of plugin AJAX and REST actions
Alert on high-volume anonymous requests to plugin-specific action names in web server access logs

Monitoring Recommendations

Forward web server and WordPress audit logs to a centralized SIEM for correlation
Baseline normal request patterns to plugin endpoints and flag deviations from unauthenticated IPs
Track plugin version drift across managed WordPress fleets to catch unpatched instances

How to Mitigate CVE-2026-57750

Immediate Actions Required

Update ez Form Calculator Premium to a version later than 2.14.1.2 as soon as the vendor releases a fix
If no fixed version is available, disable and remove the plugin until a patch is published
Restrict access to wp-admin/admin-ajax.php and plugin REST routes at the WAF or reverse proxy where feasible

Patch Information

Consult the Patchstack Vulnerability Advisory for the vendor's patched release information and upgrade guidance. Apply the fixed version across all environments once available.

Workarounds

Deploy a virtual patch or WAF rule that blocks unauthenticated requests to the vulnerable plugin actions
Limit plugin endpoint exposure to authenticated administrators using IP allow-lists or reverse-proxy authentication
Temporarily deactivate the plugin on internet-facing sites that do not actively use its features

bash

# Example nginx rule to block unauthenticated access to admin-ajax actions used by the plugin
location = /wp-admin/admin-ajax.php {
    if ($arg_action ~* "ezfc_") {
        # Require a valid WordPress logged-in cookie
        if ($http_cookie !~* "wordpress_logged_in_") {
            return 403;
        }
    }
    include fastcgi_params;
    fastcgi_pass php_upstream;
}